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A kind of preparation method of nano rare earth oxide doped molybdenum alloy electrode material

A nano-rare earth and electrode material technology, applied in the field of powder metallurgy, can solve the problems of poor quality, overhang bending, easy oxidation, etc.

Active Publication Date: 2011-12-14
XIAN FULAI ELECTRICAL ALLOY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low room temperature and high temperature strength and recrystallization temperature of domestic molybdenum electrodes, it is easy to oxidize at high temperatures, and it is easy to hang and bend after long-term service. The quality is poor and the service life is short. It is a medium and low-end product. Imported, if we can develop molybdenum electrode products with a service life increased by 50%, it will greatly reduce the production cost of fused refractory materials and glass, save energy and reduce consumption and replace imported products, and at the same time save nearly 40 tons of molybdenum electrode materials for our country every year Consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: put molybdenum powder into a ball mill tank for ball milling, the ratio of molybdenum balls to the mixture is 1:1, the rotation speed is 100r / min, and the ball milling time is 36. The ball-milled powder is then sieved through 180 mesh to remove mechanical impurities and prevent molybdenum powder from agglomerating. Then press molding, the diameter of the rubber sleeve used during pressing molding is about 90mm, and the powder is about 27kg. The molding process for preparing the molybdenum product adopts cold isostatic pressing molding, the pressure is 150Mpa, and the holding time is 30min. Pre-sintering is carried out under a hydrogen protective atmosphere before high-temperature sintering. The pre-sintering temperature is 1000°C, the pre-sintering time is 1 hour, the cooling time is 30 minutes, and the hydrogen flow rate is 1m. 3 / h. The pre-sintered molybdenum alloy rods are sintered in a medium frequency induction sintering furnace with a hydrogen flow r...

Embodiment 2

[0015] Example 2: Molybdenum alloy electrode materials with different lanthanum oxide contents were prepared according to the preparation method provided by the present invention. Use the solid-solid doping method to mix molybdenum powder and rare earth oxide powder evenly. The ball milling mixing process is: grind the nanometer rare earth oxide powder and a small amount of molybdenum powder in a ceramic mortar and put them into the ball mill with the remaining molybdenum powder. The tank was ball milled, the ratio of molybdenum balls to the mixture was 1:3, the rotating speed was 200r / min, and the ball milling time was 48 hours. The ball-milled powder is then sieved through 200 mesh to remove mechanical impurities and prevent molybdenum powder from agglomerating. Then press molding, the diameter of the rubber sleeve used during pressing molding is about 90mm, and the powder is about 32kg. The molding process of preparing the molybdenum product adopts cold isostatic pressing ...

Embodiment 3

[0016]Embodiment 3: Molybdenum alloy electrode materials with the same rare earth oxide content but doped with different types of rare earth oxides were prepared according to the preparation method provided by the present invention. Use the solid-solid doping method to mix molybdenum powder and rare earth oxide powder evenly. The ball milling mixing process is: grind the nanometer rare earth oxide powder and a small amount of molybdenum powder in a ceramic mortar and put them into the ball mill with the remaining molybdenum powder. The tank was ball milled, the ratio of molybdenum balls to the mixture was 1:2, the rotating speed was 150r / min, and the ball milling time was 48 hours. The ball-milled powder is then sieved through 200 mesh to remove mechanical impurities and prevent molybdenum powder from agglomerating. Then press molding, the diameter of the rubber sleeve used during pressing molding is about 90mm, and the powder is about 28kg. The molding process of preparing t...

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Abstract

The invention relates to a preparation method of a molybdenum alloy electrode material doped with nano rare oxides. According to the preparation method, molybdenum powder is used as a raw material, the molybdenum powder and nano rare oxide powder are uniformly mixed by adopting a solid-solid doping method, wherein the nano rare oxides are lanthana oxide, cerium oxide or mixed rare earth oxide; and then the molybdenum alloy electrode material doped with different kinds and contents of nano rare earth oxides is prepared through adopting the processes of sieving, pressing and forming, sintering,forging and vacuum annealing heat treatment under certain temperature. The preparation method disclosed by the invention and the heat treatment process are simple and feasible; and the molybdenum alloy electrode material doped with the nano rare earth oxides, which is prepared by using the method disclosed by the invention, has the characteristics of uniform tissues, high compactness, high strength, high recrystallization temperature, high elongation rate, favorable deep processing performance, and the like.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a preparation method of a molybdenum alloy electrode material doped with a nanometer rare earth oxide. Background technique [0002] my country's molybdenum resources are very rich, with 1.7719 million tons of proven molybdenum metal reserves. However, most of my country's molybdenum products are raw materials of mineral resources, while the output and export volume of high value-added molybdenum deep-processed products are less than 5%. The main applications of molybdenum materials are molybdenum rounds for power electronics, perforated molybdenum plugs for metallurgy, high-temperature furnace parts, molybdenum wires for automotive spraying, and molybdenum electrodes for glass furnaces. Molybdenum electrode is a consumable material, mainly used in fused refractory materials, glass industry, etc., and is a key product that affects the output and quality of g...

Claims

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Application Information

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IPC IPC(8): B22F3/16B21J5/02
Inventor 孙军江峰周葵涛张国君刘刚孙院军陈小曼
Owner XIAN FULAI ELECTRICAL ALLOY
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